Pregunta
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2. There is a pine tree that may be too close to Jamal's house. He can't physically measure the tree, but he thinks it may hit his house someday. He is 6 feet tall and has a shadow that is 4 feet. At the same time of day, the tree casts a shadow that is 28 feet. a. Draw and label a picture to represent this scenario. Using the measurements, determine the height of the tree. b. If the base of the tree is 80 feet from the house, will it hit the house if it falls? Justify your answer.

Ask by Williams Nguyen. in the United States
Jan 24,2025

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The pine tree is 42 feet tall. If it falls, it won't hit the house because its reach is only 42 feet, which is less than the 80 feet distance from the house.

Solución

Sure, let's tackle Jamal's pine tree problem step by step. --- ### **Problem Summary:** - **Jamal's Height:** 6 feet - **Jamal's Shadow:** 4 feet - **Tree's Shadow:** 28 feet - **Distance from Tree to House:** 80 feet --- ### **Part a: Determine the Height of the Tree** #### **1. Diagram Representation:** Since I can't draw the diagram here, I'll describe it so you can visualize or sketch it yourself: - **Triangles Involved:** - **Jamal's Triangle:** Represents Jamal and his shadow. - **Height:** 6 feet (vertical) - **Shadow Length:** 4 feet (horizontal) - **Tree's Triangle:** Represents the pine tree and its shadow. - **Height:** Unknown (let's denote it as *h*) - **Shadow Length:** 28 feet (horizontal) - **Labeling:** - Both triangles share the same angle of elevation from the ground to the sun, making them **similar triangles**. #### **2. Using Similar Triangles to Find the Tree's Height:** Since the triangles are similar, the ratios of corresponding sides are equal. \[ \frac{\text{Height of Jamal}}{\text{Shadow of Jamal}} = \frac{\text{Height of Tree}}{\text{Shadow of Tree}} \] Plugging in the known values: \[ \frac{6\, \text{ft}}{4\, \text{ft}} = \frac{h}{28\, \text{ft}} \] **Solve for *h*:** \[ h = \frac{6\, \text{ft} \times 28\, \text{ft}}{4\, \text{ft}} = \frac{168\, \text{ft}^2}{4\, \text{ft}} = 42\, \text{ft} \] **Therefore, the height of the pine tree is **42 feet**.** --- ### **Part b: Will the Tree Hit the House if it Falls?** #### **Given:** - **Height of Tree (from Part a):** 42 feet - **Distance from Tree to House:** 80 feet #### **Analysis:** When the tree falls towards the house, the **maximum horizontal distance** it can cover is equal to its height (assuming it falls perfectly horizontally). - **Maximum Reach of the Tree:** 42 feet - **Distance to House:** 80 feet #### **Conclusion:** Since the **maximum reach of the tree (42 feet)** is **less than the distance to the house (80 feet)**, the tree **will not** reach or hit the house if it falls towards it. --- ### **Final Answers:** **a.** The pine tree is **42 feet** tall. **b.** No, the tree will **not** hit the house if it falls. Its maximum reach of 42 feet is **less than** the 80 feet distance to the house.

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The Deep Dive

Using similar triangles is a fantastic way to tackle this! Since Jamal's height and shadow can be used as a reference, we can set up a ratio between them and the tree's unknown height. If Jamal is 6 feet tall and his shadow is 4 feet, we can say: Height/Shadow = 6/4 = 1.5. Now applying this to the tree, we know it casts a 28-foot shadow. Therefore, we can set up the equation: Height (tree) / 28 feet = 6 feet / 4 feet. Cross-multiplying, we find that the height of the tree is 42 feet! As for whether it will hit the house, let's visualize this! If the base of the tree is 80 feet from Jamal's house and the tree's height is 42 feet, when it falls, it'll hit at most the length of its height towards the house. Since the height of the tree (42 feet) is significantly less than the 80 feet distance from the house, it won't reach the house if it falls. Phew! Looks like Jamal's home is safe from this pine tree!

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